To get there employ standard manafarm techniques, max freeze, heat sparks with G24(highest grade you want for wisdom spark), fill towers, choose good spots for shrine scrolls, etc.
I have bad luck on shrines this run :P...currently even at wave 900 still got +0 bonus blades shrine. Have 4 armor tearing and 5 infection....1 venom extra, thank god. helps with annoying out of range spires.